18 of the 19 questions tagged "Solstice" are his solstice. Assuming we can't outright change it (after all, how would future solstice enthusiasts find solstice related questions?) could we get some kind of "Solstice of Sorrow" or "Guess who's back; back again" tag going?
My thought is that it adds a fun little tag for this legendary little car, so that future readers can stumble upon, and be awed by, the epic tale. But on the other hand stack isn't exactly about "fun"